Negative-acknowledge character
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In telecommunications, a negative-acknowledge character (NAK) is a transmission control character sent by a station as a negative response to the station with which the connection has been set up.
Note 1: In binary synchronous communication protocol, the NAK is used to indicate that an error was detected in the previously received block and that the receiver is ready to accept retransmission of that block.
Note 2: In multipoint systems, the NAK is used as the not-ready reply to a poll.
Sources: Federal Standard 1037C and from MIL-STD-188
Also used as an acronym in internet forums and chats (mainly technology and nerd user groups) for "I don't agree" or "That's wrong".
In the ASCII code, the NAK character is 0x15 (hexadecimal).
See also
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